New achievements of black liquor drying technology Time:2015-08-24
Paper emissions are the largest source of China's water pollution, pollution control has been the black liquor is a very troublesome problem, because black liquor containing lignin biodegradation, and other toxic substances, so that black liquor treatment is very difficult. Pollution can not be solved because of the current black liquor, the state forcibly shut down a considerable number of small paper mills, paper mills are also many existing problems facing the cut-off due to pollution crisis.
Shenyang, Northeastern University, a company relies on technology, in-depth theoretical study and a lot of practical work, with the spray (tube) Horizontal thin film evaporator plus spray-drying method has successfully solved the problem of black liquor dry. The technology is characterized by high technology, engineering and advanced technology, the process is simple, less investment.
Black liquor (or red liquid) first with horizontal thin-film evaporation method, the liquid concentration for 55% to 45%, then enter the Spray Dryer spray drying.
Spray-drying process: heated air through the stove, the hot air generated from the drying room at the top of the volute channel, produced by the uniform rotation of the hot air flow divider into the drying chamber. The sulfonation reaction of the black liquor by high-speed rotating disk atomization to produce fine material dispersed mist, fog and swirling hot material exposed to the air, evaporation and, in a very short period of time materials are dry. It features liquid atomization, large surface area, moments evaporate quickly, a few seconds to dry, and can adjust the particle size.
